Question

Which out of the following cannot be broken down into simpler substances by
chemical means?
a. Element
b. Compound
C. Mixture
d. Molecule
What is the chemical symbol of iron?
a. Ir
b. !
C. Fe
d. F
Which of the following represents the chemical formula of a compound?
b. Ca
d. CO
What are the new substances (elements/compounds) formed in a chemical reaction
called?
a. Rust
b. Products
c. Mixtures d. Reactants
What is the substance responsible for the browning of cut surfaces of vegetables and
fruits called?
a. Zinc
b. Melanin
C. Rust
d. Copper
Which of the following elements exist as tetratomic molecules?
a. Hydrogen
b. Nitrogen
c. Potassium d. Phosphorous
What is the chemical formula for sodium oxide?
a. Nao
C. NaO,
d. Na o
Which gas is released in reaction of vinegar with baking soda?
a. Oxygen
b. Nitrogen
c Carbon dioxide d. Carbon monoxide
Which of the following elements exhibits valency 2?
a. Oxygen
b. Sodium
C. Aluminium d. Nitrogen
Which of the following represents an element?
a. Naci
b. CI,
d. KCI
b. Na, o
C. HCI

Answer 1

Answer:

1. molecule

2. fe

3.CO

4. products

5.melanin

6.Na2O

7.co2

8.oxygen

9. cl

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Expanation: